Armored inner tube.



H. Nl WAYNE.

ARMOHED INNER TUBE. APPLICATION FILED OCT. 255191?.

1,297,278. Paen Mar. 11, 1919.

Z SHEETS-SHEET I- F15 Fly@ 2,

ffy@ @MKZ/ Arr'ys..

N. WAYNE.

ARMORED INNER TUBE.

APPLICATION FILED ocr. 29. |911.

Patented Mar. l1, i919.

2 SHETS-SHEET 2.

@gsi 555.6..

FIIIGJ;

Ffa@

" En srnrn's PATENT onirica.

HERBERT N. WAYNE, OF LOS ANGELES, CALIFOBNIA, ASSIG1WO TO ARMOR'CORD -TIRE t RUBBER CO., A CORPORATION 0F DELAWARE.

Animonnn INNER'. TUBE.

Speoiication of Letters Patent.

Patented Mar. 11, 191e.

Application led October 29, 1917. Serial No. 199,098.

To all lwhom z't may concern; f

Be it known that I, HERBERT N. WAYNE, a. citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Armored Inner Tubes, of which the following is a specifica- This invention relates to a pneumatic`v tire and particularly pertains to an armored inner tube therefor.

It is the principal object of this invention to provide an inner tube to be inflated within a pneumatic tire casing which embodies certain features of construction which insure that it will be 'reinforced without losing its iexibility and will allow the tube to expand circumferentially and axially without interference from the reinforcement.

.Another object of this invention is to provide an armored innertube which will thoroughly reinforce the outer circumference and the side walls of the tube against blowout and puncture and allow circumferential expansion of the tube, at the same time leavin the' inner circumferential wall of the tu e free to expand where reinforced by the tirer-im and the op osing tire beads.

Another object of) this invention is to r0- vide atube of the above character w ich may be formed.by a simple process of construction to apply an armored wall to a pneumatic tubing which may thereafter be permanently shaped to conform to the oasi within which it is to be positioned.

nther objects will appear hereinafter.-

The invention is illustrated, by wayr of eiramplef, Vin the accompanying drawings in l which: .1

Figurel is a view in perspective illustrating a fr entary portion of the tire casing within vildh the preferred form of the armored tube is positioned.

Fig. 2'is-a view in perspective similar to Fig.',1, illustrating another formy of the arz mored tube in position.

Fig. 3 is a view in side elevation illustratl ing a fragmentary portion of a tirevcasing and with parts broken away to disclose the position of the form of the tube shown in Fig. 1.

Fig. 4 is a view in transverse section illustrating the first step in the process of forming` the armored covering.

iig. 5 is a viewk similar to Fig. 4 illustrat- -which the armored covering is placed upon theinier tube.

Fig. 48 is a view in elevation' illustrating a fragmentary' portion of anotherform of the 65' armored covering in which longitudinally and laterally extending cords are used' as re# inforceinents. f

Fig. 9 is a view in 'transverse section illustrating the form of ,the armored tube shown in Fig. 8 as in position.

Fig. 10 is a fragment view in section illustrating the tube with its longitudinally and laterally extending. cords overlappingA along their contiguous edges and disposed 7e within a tire casing.

Referring more Iiliarticularly' to thedrawr y ings, 10 indicates t e outer casing of apneu.- matlc tire adaptedto be iniiated by a spe-y cially formed vided with an armorediouter covering .12. Inthe preferred form of my invention asv shown in Fig. 1 this cov consists-of laterally arranged'cords which extend' around the outer circumference and along the sides .ofthe tube, terminating at points adjacent but within the necks of the tire beads. of the casing. When so constructed the cords may separate to provide circumferential expan-N sion 'of the tube and will reinforce the main 90 outer wall of the casing without limiting the v expansive actlon of the inner circumferential l wall of the tube whichis held in a manner to tuprevent blow-out above thev clencher be s of the casing an the clencher 95A The method. 0f tha amoredcan* and the tube will be hereinafter desorl In the form' of the 'device shown in Fig. 2

the armored covering vis formed with loosel end flaps 13 and 14 which are ,provided to 100 entirely surround :the inner circumference of the tube and and pinchin T us it will be seen 'that b combining t e two functions ofthe rdb1 'thev entire wall of the tube will be protected 105 against the actions -which are most `injurious to it at various points Other forms of the tube are shown in,

along its wall.

' 9 and 10 in which it will be seen that t e''/ space between the ends of. the armored latfragmentary i inner tube 11, which is pro- 80 rotect it against chang l had eral cord covering is filled by a layer of longitudinally arranged cords to reinforce the inner wall of the tube circumferentialiy and permit it to expand laterally.

iVhen forming the armored inner tube the outer protective covering is first formed by applying` a thin coating; 15 of rubber or other binding material to the outer surface of a. straight cv'lindrical mandrel 16, after which a layer of cord 1T is applied to the rubber coating. T his cord is wound around the mandrel and drawn tightl)1 thereupon to cause the rubber coating,T of the mandrel to be pressed in between the strands of cord to act as a binder. rthis binding action is facilitated by first passing the cord through a solution of rubber cement. Vhen the cord has been applied it will form a layer having the outward appearance. indicated in Fig. 3, and will be onljy7 the thickness of the diameter ofthe cord, as the layer of rubber will be pressed between the cords. This cord layer is then cemented to the inner tube. TWhen the form of tube shown in Fig. 1 is to be made the mandrel 16 is of a diameter substantiall)7 that of the circular cavity of the casing 10 so that. the tube meerY be. vulcanized within a circular cavity mold and will, when inflated. during` the vulcanizing process, cause the inner circumference of the tube to be distended, as particular-l)7 shown in Fig; 1 and to allow the ends of the layer of cord to terminate at, opposite sides of the tube and adjacent but within the neck of the casingbeads. 1n the form of the device shown in Fig. 2 a still larger mandrel is used so that there will be a surplus of cord which will hang down from the distendcd inner circumferential wall to protect it when in position Within the casing.

It is to be understood that the layer of cord formed upon the mandrel is split longitudinally and that in forming` the armored tube shown in Fig. S the mandrel 1G is of a small diameter, after which the llayer of cord 17 is transferred to a larger mandrel 18 over Which the inner tube. has been positioned, where it isA cemented into place over the tube. The outer circumference of the inner tube is sufficiently larger than the small mandrel 1G to cause the cut edges of the layer of cord to be separated a considerable distance, as shown in Fifi, 7. This space represents the. inner circumferential Wall of the tube and is filled by a layer 19 of longitudinally extending cords. which con tinue around the entire inner circumference of the tube. This layer of cords has been formed by being wrapped an And a suitable mandrel and there bound together by rubber or cement. `When the layer 19 has been cemented in place the armored tube is placed Within a circular curing mold where it is inflated and vulcanized.

ln the forni of the device shown in r ig.

10 the contiguous edges of the cord layers 17 and 19 do notabnt against. each other but overlap to provide a reinforcementat the narrow portion of the side walls of the outer casing,

rllhe tubes formed as described will conform to the cavity within a circular tire casing and will resiliently support it in a natural manner while the walls of the tube are limited in their movement.y the outer walls being` provided with circumferential expansion onlvand the innerwall with lateral expansion. The circumferential expansion will occur throughout substantiall)- seVen-eighths of the circumference of the tire while. thelateral expansion will take place in the remaining one-eighth of the tube. l

It is evident that the weakest points in the tire casing are along the. reduced side walls of the casing adjacent the tire beads.

,It will be understood that one or more layers of cord or thread mav be used. l'f a, .single layer is used. the'thickness or the cord jor thread is increased so as to produce a requisite strength. However. if more than one laver is used. the thickness of the cord or thread ma)v be reduced in proportion to the strength required.

It will thus be seen that the tube here disclosed mav be easil)7 and economiciallv manufactured and will provide an armored protecting cover which will allow the. tube to have flexible movement and at the same time will prevent it from being chafed, punctured` pinched or blown out.

While l have shown the preferred construction of my armored inner tube as now known to me, it will be understood that various changes in thecombination. construction and arrangement of parts may be m'ade bv those skilled in the art without departing from the spirit of miv invention as claimed.

claim:

1. A tire tube comprising a wall of elastie material, and a reinforcing;v layer assoeiated with the elestic wall comprising a series of substantiallyv parallel cords extendingl throughout a `certain circumferential part of the elastic wall, the remaining circumferential part of the elastic wall being free. from association with said cords, whereby the first mentioned part is allowed elastic expansion in adirection transverseof thev cords but is limited in expansion longitudinal of the cords and the second mentioned part is allowed elastic expansion in the direction in which expansion is limited in the lirst mentioned part.

L?. tire tube comprising' a wall of elastic material, and a reinforcingr layer asso ciated with the elastic wall comprising a series of transversel)Y extending' cords around the outer circumferential part of the tube. the inner circumferential part of the ferential part of longitudinal el eral expansion ed the 1 part of the tube is allowe h part of the tube is allo pension but is limit pension.

oeiation with seid the tube is allowed elastic @nsion but is limited in leb 'nner circumferential d lateral expansion.

sing a Wall of elastic inner:l cireumierential Wed elastic lateral e ed 1n longitudinal eX- l longitudinally o around the inner cii'oum may lieve limited of cords; whereby the outer oireumferential part of the tube is allowed elastic longitudinel expansion but is limited in lateral eX iongitudinal expansion.

5. A tire tube comprising e wail of elastic material, end reinforoing layer associated with the elastic wel! comprising a series of 40 extendi f corde exfeiidin erential portion/of the tube, the outer circumferential portion of the tube being free from association with said longitudinal cords; so that the inner circumferential part of the tube is allowed elastic later-ei expansion but limited in longitudinal expansion.

6. A tire tube comprising en inner Wall of elastic material. en outer mili of non-elastic material covering the outer circumference und the sides of the tube whereby the tube longitudinal expansion, and means whereby the remainder ofthe tube will be protected from ehaiing and abrasion and will be permitted to expand laterally of the tire.

In testimony whereof neme to this specificationD HERBERT N. `W1YNE have signed my 

